An electromagnetic induction heating device and method for hot repair of asphalt pavement

Abstract

The present invention relates to an electromagnetic induction heating device and method for hot repair of asphalt pavement, comprising an X-axis horizontal moving component, a Y-axis horizontal moving component, a Z-axis vertical moving component, an electromagnetic induction heating component, a frame and a roller; the Z-axis vertical moving component is arranged between the left and right sides of the frame along the Z-axis direction; the X-axis horizontal moving component is arranged below the middle of the Z-axis vertical moving component along the X-axis direction; the Y-axis horizontal moving component is arranged below the X-axis horizontal moving component along the Y-axis direction; the electromagnetic induction heating component is arranged below the Y-axis horizontal moving component; and the rollers are arranged at the four corners of the bottom of the frame. The electromagnetic induction heating asphalt mixture self-repairing technology of the present invention directly heats the asphalt rather than the aggregate through the Joule heat generated in the conductive material, thereby minimizing the damage to the asphalt material such as warping and deformation, heating evenly, avoiding local overheating of the test piece, and being fast, efficient, energy-saving and environmentally friendly.

Description

Technical Field

[0001] The present invention relates to the field of heat treatment technology, and in particular to an electromagnetic induction heating device and method for thermal repair of asphalt pavement. Background Art

[0002] Most of the roads in my country are made of asphalt concrete pavement. Under repeated loads, asphalt concrete pavement gradually produces fatigue cracks. If not maintained in time, it will further cause other secondary diseases such as cracking, water damage and potholes, and ultimately weaken the strength and stiffness of the asphalt concrete pavement, reducing its design service life. In recent years, the self-repairing properties of asphalt materials have gradually attracted the attention of scholars from various countries. In 1967, Bazin et al. first discovered the self-repairing properties of asphalt materials and defined its self-repair as: the strength and stiffness of damaged asphalt materials undergo a complex process of self-repair, which accompanies the entire service process of asphalt materials (load and intermittent state). Scholars from various countries are also working hard to study the self-repairing mechanism of asphalt materials and their influencing factors, and try to find effective methods to improve the self-repairing performance of asphalt materials, in order to achieve the purpose of improving the maintenance technology of asphalt concrete pavement and extending the service life of asphalt concrete pavement.

[0003] At present, the main methods for enhancing the self-healing performance of asphalt materials are microcapsule method, photorepair method and temperature promotion method. Among them, although the microcapsule method has a good self-repair rate, it still faces key problems such as high cost, high requirements for capsule performance and construction technology, and only has a single self-repair function; the photorepair method uses ultraviolet rays in sunlight to recombine the free radicals of broken polymer repair agents in damaged asphalt materials to achieve the purpose of healing cracks, but it has obvious limitations due to defects such as high price of polymer repair agents and low ultraviolet content in sunlight; the self-repairing property is an inherent property of asphalt materials, but due to its unique viscoelasticity and temperature sensitivity, the self-repair of asphalt materials is very slow at low temperatures, and the self-repairing property is greatly improved at higher temperatures. Therefore, researchers have tried to propose a method of promoting the self-repair of asphalt materials by heating with microwave and electromagnetic induction heating. Although microwave heating is fast and has a high temperature, it has poor heating uniformity, which can easily cause the local temperature of the asphalt material to be too high, destroying its physical and chemical structure and causing excessive additional damage to the material. Therefore, the existing asphalt material repair methods all have certain limitations or shortcomings, and there is still room for further improvement and improvement. Summary of the invention

[0004] In view of the above problems, the purpose of the present invention is to provide an electromagnetic induction heating device and method for thermal repair of asphalt pavement, which has the characteristics of high efficiency, uniform heating, and improved energy utilization.

[0005] The technical solution adopted by the present invention is as follows:

[0006] The electromagnetic induction heating device for hot repair of asphalt pavement proposed in the present invention comprises an X-direction horizontal moving component, a Y-direction horizontal moving component, a Z-direction vertical moving component, an electromagnetic induction heating component, a frame and a roller; the Z-direction vertical moving component is arranged between the left and right sides of the frame along the Z-axis direction; the X-direction horizontal moving component is arranged below the middle of the Z-direction vertical moving component along the X-axis direction; the Y-direction horizontal moving component is arranged below the X-direction horizontal moving component along the Y-axis direction; the electromagnetic induction heating component is arranged below the Y-direction horizontal moving component; and the rollers are respectively arranged at the four corners of the bottom of the frame.

[0007] Furthermore, the Z-axis vertical movement component includes a Z-axis stepper motor, a Z-axis coupling, a Z-axis ball screw bracket I, a Z-axis ball screw, a Z-axis screw slide frame, a Z-axis linear guide slider, a Z-axis linear guide, a Z-axis base plate, a Z-axis ball screw bracket II and a vertical-horizontal platform connector; the Z-axis base plates are vertically arranged on the left and right sides of the frame and are symmetrical to each other; Z-axis linear guides are vertically arranged on both sides of the inner end surface of the Z-axis base plate, and the Z-axis linear guides on the two sides of the Z-axis base plates are symmetrical to each other; the Z-axis ball screw The rod bracket I and the Z-axis ball screw bracket II are respectively arranged on the upper and lower sides of the middle part of the inner end surface of the Z-axis base plate on one side; the Z-axis ball screw is connected between the Z-axis ball screw bracket I and the Z-axis ball screw bracket II; the Z-axis stepping motor is connected to the upper end of the Z-axis ball screw through the Z-axis coupling; the left and right ends of the vertical-horizontal platform connecting piece are respectively slidably connected to the Z-axis linear guides on both sides through the Z-axis linear guide sliders; the middle part of one side of the vertical-horizontal platform connecting piece is slidably connected to the Z-axis ball screw through the Z-axis screw sliding frame.

[0008] Furthermore, the X-axis horizontal movement assembly includes an X-axis stepping motor, an X-axis coupling, an X-axis ball screw bracket I, an X-axis screw support I, an X-axis guide rail slider, an X-axis screw sliding frame, an X-axis linear guide rail, an X-axis ball screw, an X-axis base plate, an X-axis ball screw bracket II and an X-axis screw support II; the X-axis ball screw bracket I and the X-axis ball screw bracket II are respectively arranged in the middle of the left and right sides of the lower end surface of the X-axis base plate; the X-axis ball screw is connected between the X-axis ball screw bracket I and the X-axis ball screw bracket II, and the X-axis ball screw One side of the screw is connected to the X-axis ball screw bracket I through the X-axis screw support I, and the other side is connected to the X-axis ball screw bracket II through the X-axis screw support II; the X-axis screw sliding frame is slidably connected to the X-axis ball screw; the X-axis stepping motor is connected to one end of the X-axis ball screw through the X-axis coupling; the X-axis linear guides are respectively arranged on the front and rear sides of the lower end surface of the X-axis base plate and are symmetrical to each other; the X-axis guide sliders are respectively slidably connected to the X-axis linear guides; the upper end surface of the X-axis base plate is fixedly connected to the bottom of the vertical and horizontal platform connecting piece.

[0009] Furthermore, the Y-axis horizontal movement component includes a Y-axis stepping motor, a Y-axis coupling, a Y-axis ball screw bracket I, a Y-axis screw support I, a Y-axis guide slider, a Y-axis screw slide frame, a Y-axis linear guide, a Y-axis ball screw, a Y-axis base plate, a Y-axis ball screw bracket II and a Y-axis screw support II; the Y-axis base plate is fixedly connected to the middle of the bottom end of the vertical horizontal platform connecting member; the Y-axis ball screw bracket I and the Y-axis ball screw bracket II are respectively arranged in the middle of the left and right sides of the lower end surface of the Y-axis base plate; the Y-axis ball screw is connected to the Y-axis ball screw bracket I and the Y-axis ball screw bracket Ⅱ, and one side of the Y-axis ball screw is connected to the Y-axis ball screw bracket Ⅰ through the Y-axis screw support Ⅰ, and the other side is connected to the Y-axis ball screw bracket Ⅱ through the Y-axis screw support Ⅱ; the Y-axis screw sliding frame is slidably connected to the Y-axis ball screw; the Y-axis stepping motor is connected to one end of the Y-axis ball screw through the Y-axis coupling; the Y-axis linear guides are respectively arranged on the front and rear sides of the lower end surface of the Y-axis base plate and are symmetrical to each other; the Y-axis guide sliders are respectively slidably connected to the Y-axis linear guides; the middle part of the upper end surface of the Y-axis base plate is respectively fixedly connected to the X-axis screw sliding frame and the X-axis guide slider.

[0010] Furthermore, the electromagnetic induction heating assembly includes an induction coil base plate, an electromagnetic induction heating coil, a coil magnet, a distance sensor, an infrared temperature sensor I and a sensor bracket I; the electromagnetic induction heating coil is installed inside the coil magnet; the coil magnet is evenly arranged on the lower end surface of the induction coil base plate; the sensor bracket I is fixed to the middle part of one side of the induction coil base plate; the distance sensor and the infrared temperature sensor I are respectively installed on the sensor bracket I; the middle part of the upper end surface of the induction coil base plate is respectively fixedly connected to the Y-axis lead screw sliding bracket and the Y-axis guide rail sliding block.

[0011] Furthermore, a dehumidification component is arranged on the front side of the bottom of the frame.

[0012] Furthermore, the dehumidification component includes a resistance wire mounting frame, a resistance wire, a humidity sensor, an infrared temperature sensor II and a sensor bracket II; the resistance wire is installed on the lower end surface of the resistance wire mounting frame; the sensor bracket II is fixed on one side of the bottom of the resistance wire mounting frame; the humidity sensor and the infrared temperature sensor II are respectively installed on the sensor bracket II; the resistance wire mounting frame is fixed between the left and right sides of the bottom of the front end of the frame.

[0013] A method for hot repair of asphalt pavement, comprising the following steps:

[0014] S1, induction heating preparation stage:

[0015] (S1.1) Setting initial parameters: Determine the optimal heating temperature T and the optimal heating time t of the asphalt pavement material to be heated 1, the optimal heating distance d between the bottom surface of the electromagnetic induction heating coil 402 and the road surface, and the extreme value a of the suitable heating temperature difference of the asphalt material;

[0016] (S1.2) Turn on the distance sensor, infrared temperature sensor I, infrared temperature sensor II and humidity sensor, the computer reads the measurement result of the distance sensor, obtains the distance l between the bottom surface of the electromagnetic induction heating coil 402 and the road surface, and the computer controls the X-axis stepper motor, the Y-axis stepper motor and the Z-axis stepper motor to rotate respectively, and adjusts the position of the induction heating coil so that the distance l between the bottom surface of the electromagnetic induction heating coil 402 and the road surface is equal to d, and the bottom surface of the electromagnetic induction heating coil 402 faces the road surface that needs to be heated and repaired;

[0017] (S1.3) The humidity sensor measures the air humidity above the road surface in real time as h, and the infrared temperature sensor II measures the road surface asphalt temperature in real time as T 2 ; Controlled by computer: if h>40%, the resistance wire starts to heat the road surface to remove moisture from the ground; if h<40%, the resistance wire stops heating, the device moves forward, and the induction heating coil performs thermal repair on the road surface asphalt material; during this period, if T 2 ≤Ta, then increase the resistance wire current to improve the heating effect; if T 2 ≥T+a, then reduce the resistance wire current to avoid the road asphalt material softening and expanding due to excessive temperature, which will lead to a decrease in the material structure strength; if Ta<T 2 <T+a, then keep the resistance wire heating current;

[0018] S2, induction heating stage:

[0019] (S2.1) The induction heating coil is powered on, the coil heats up and starts to heat the road asphalt; the computer starts timing the heating time t;

[0020] (S2.2) Computer calculation and control: Infrared temperature sensor I measures the asphalt temperature of the heated road surface as T 1 :If T 1 ≤Ta, then increase the induction heating coil current to improve the heating effect; if T 1 ≥T+a, then reduce the induction heating coil current to avoid the road asphalt material from softening and expanding due to excessive temperature, which will lead to a decrease in the material structure strength; if Ta<T 1 <T+a, then the heating current of the induction heating coil is maintained;

[0021] (S2.3) is controlled by computer calculation: if t≤t 1 , the induction heating coil maintains the thermal repair of the road asphalt material; if t>t 1 , the thermal repair work of the asphalt material is completed, the induction heating coil is powered off, and the heating is stopped;

[0022] (S2.4) The device moves forward and starts hot repairing the asphalt material of the next road surface;

[0023] (S2.5) The induction heating stage of step S2 is repeated until all target road asphalt materials are thermally repaired.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] 1. The road surface is thermally repaired by electromagnetic induction heating, which has a fast heating speed and can quickly reach the target temperature. The heating temperature can be adjusted by adjusting the power supply parameters, and the heating effect is more controllable. The electromagnetic induction heating coil is placed in the coil magnetic conductor, and the coil magnetic conductor can concentrate the alternating magnetic field of the induction coil on the asphalt road surface, reducing energy loss and thus improving energy utilization efficiency.

[0026] 2. Induction thermal repair should be carried out under dry conditions. The presence of moisture on the road surface will greatly reduce the thermal repair effect of the asphalt pavement. The front resistance wire dehumidification component close to the resistance wire of the road surface is energized to heat the road surface, which can reduce the moisture on the road surface, create suitable conditions for subsequent induction heating, and improve the effect of induction heating thermal repair, thereby improving energy utilization efficiency.

[0027] 3. The frame and rollers enable the induction heating device to work while moving, ensuring the uniformity and continuity of the induction heating effect of the asphalt pavement, thereby improving work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the overall structure of the device of the present invention;

[0029] Figure 2 It is a schematic diagram of the structure of the Z-direction vertical driving device in the present invention;

[0030] Figure 3 It is a structural schematic diagram of the X-axis horizontal driving device in the present invention;

[0031] Figure 4 It is a structural schematic diagram of the Y-axis horizontal driving device in the present invention;

[0032] Figure 5 It is a schematic diagram of the structure of the electromagnetic induction heating assembly in the present invention;

[0033] Figure 6 This is a schematic diagram of the resistance wire dehumidification component of the present invention;

[0034] Figure 7 is a flow chart of the method of the present invention;

[0035] Among them, the figure marks are: 1-Z-direction vertical driving device; 101-Z-direction stepping motor; 102-Z-direction coupling; 103-Z-direction ball screw bracket Ⅰ; 104-Z-direction ball screw; 105-Z-direction screw sliding frame; 106-Z-direction linear guide slider; 107-Z-direction linear guide; 108-Z-direction base plate Ⅰ; 109-Z-direction ball screw nut bracket Ⅱ; 110-vertical and horizontal platform connecting piece; 2 -X-axis horizontal drive device; 201-X-axis stepper motor; 202-X-axis coupling; 203-X-axis ball screw support Ⅰ; 204-X-axis screw support Ⅰ; 205-X-axis guide slider; 206-X-axis screw slide frame; 207-X-axis linear guide; 208-X-axis ball screw; 209-X-axis base plate; 210-X-axis ball screw support Ⅱ; 211-X-axis screw support Ⅱ; 3-Y-axis water Horizontal drive device; 301-Y-axis stepper motor; 302-Y-axis coupling; 303-Y-axis ball screw bracket Ⅰ; 304-Y-axis screw support Ⅰ; 305-Y-axis guide rail slider; 306-Y-axis screw sliding frame; 307-Y-axis linear guide; 308-Y-axis ball screw; 309-Y-axis base plate; 310-Y-axis ball screw bracket Ⅱ; 311-Y-axis screw support Ⅱ; 4-electromagnetic induction heating component; 401-induction coil base plate; 402-electromagnetic induction coil; 403-coil magnetic conductor; 404-sensor bracket Ⅰ; 405-infrared temperature sensor Ⅰ; 406-distance sensor; 5-resistance wire dehumidification component; 501-resistance wire mounting frame; 502-resistance wire; 503-infrared temperature sensor Ⅱ; 504-humidity sensor; 505-sensor bracket Ⅱ; 6-frame; 7-roller. DETAILED DESCRIPTION

[0036] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0037] It should be noted that, in the description of the present invention, the terms "up", "down", "top", "bottom", "one side", "the other side", "left", "right", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not mean that the device or element must have a specific orientation, be constructed and operated in a specific orientation.

[0038] See attached Figure 1, gives a specific structure of an embodiment of an electromagnetic induction heating device for hot repair of asphalt pavement proposed by the present invention, the device includes a Z-axis vertical moving component 1, an X-axis horizontal moving component 2, a Y-axis horizontal moving component 3, an electromagnetic induction heating component 4, a dehumidification component 5, a frame 6 and a roller 7; the frame 6 is a rectangular frame; the Z-axis vertical moving component 1 is arranged between the left and right sides of the frame 6 along the Z-axis direction; the X-axis horizontal moving component 2 is arranged below the middle of the Z-axis vertical moving component 1 along the X-axis direction; the Y-axis horizontal moving component 3 is arranged below the X-axis horizontal moving component 2 along the Y-axis direction; the electromagnetic induction heating component 4 is arranged below the Y-axis horizontal moving component 3; the dehumidification component is arranged between the front bottom of the frame; and the rollers 7 are respectively arranged at the four corners of the bottom of the frame 6.

[0039] Among them, as attached Figure 2 As shown, the Z-axis vertical movement component 1 includes a Z-axis stepping motor 101, a Z-axis coupling 102, a Z-axis ball screw bracket Ⅰ103, a Z-axis ball screw 104, a Z-axis screw slide frame 105, a Z-axis linear guide slider 106, a Z-axis linear guide 107, a Z-axis base plate 108, a Z-axis ball screw bracket Ⅱ109 and a vertical and horizontal platform connector 110; the Z-axis base plates 108 are vertically arranged on the left and right sides of the frame 6 and are symmetrical to each other; the front and rear sides of the inner end surface of each Z-axis base plate 108 are symmetrically arranged with vertical Z-axis linear guides 107, and the Z-axis linear guides 107 on the two sides of the Z-axis base plates 108 are symmetrical to each other; the Z-axis ball screw bracket Ⅰ103 and the Z-axis ball The screw support II 109 is respectively arranged on the upper and lower sides of the middle part of the inner end surface of the right Z-axis base plate 108; the Z-axis ball screw 104 is connected between the Z-axis ball screw support I 103 and the Z-axis ball screw support II 109 through a screw support; the Z-axis stepper motor 101 is connected to the upper end of the Z-axis ball screw 104 through a Z-axis coupling 102; the left and right ends of the vertical-horizontal platform connector 110 are respectively slidably connected to the Z-axis linear guides 107 on both sides through the Z-axis linear guide sliders 106; the middle part of one side end surface of the vertical-horizontal platform connector 110 is fixedly connected to the screw nut of the Z-axis ball screw 104 through the Z-axis screw sliding frame 105, and then slidably connected to the Z-axis ball screw 104.

[0040] As attached Figure 3As shown, the X-axis horizontal moving assembly 2 includes an X-axis stepping motor 201, an X-axis coupling 202, an X-axis ball screw bracket Ⅰ203, an X-axis screw support Ⅰ204, an X-axis guide rail slider 205, an X-axis screw slide frame 206, an X-axis linear guide 207, an X-axis ball screw 208, an X-axis base plate 209, an X-axis ball screw bracket Ⅱ210 and an X-axis screw support Ⅱ211; the X-axis ball screw bracket Ⅰ203 and the X-axis ball screw bracket Ⅱ210 are respectively arranged at the middle of the left and right sides of the lower end surface of the X-axis base plate 209; the X-axis ball screw 208 is connected between the X-axis ball screw bracket Ⅰ203 and the X-axis ball screw bracket Ⅱ210, and the X-axis ball screw 2 One side of 08 is connected to the X-axis ball screw bracket Ⅰ203 through the X-axis screw support Ⅰ204, and the other side is connected to the X-axis ball screw bracket Ⅱ210 through the X-axis screw support Ⅱ211; the X-axis screw slide frame 206 is slidably connected to the X-axis ball screw 208 through the screw nut; the X-axis stepper motor 201 is connected to one end of the X-axis ball screw 208 through the X-axis coupling 202; the X-axis linear guide rails 207 are respectively arranged on the front and rear sides of the lower end surface of the X-axis base plate 209 and are symmetrical to each other; the X-axis guide sliders 205 are respectively slidably connected to the X-axis linear guide rails 207; the upper end surface of the X-axis base plate 209 is fixedly connected to the bottom of the vertical and horizontal platform connecting piece 110.

[0041] As attached Figure 4 As shown, the Y-axis horizontal moving component 3 includes a Y-axis stepping motor 301, a Y-axis coupling 303, a Y-axis ball screw bracket I303, a Y-axis screw support I304, a Y-axis guide slider 305, a Y-axis screw slide frame 306, a Y-axis linear guide 307, a Y-axis ball screw 308, a Y-axis base plate 309, a Y-axis ball screw bracket II310 and a Y-axis screw support II311; the Y-axis ball screw bracket I303 and the Y-axis ball screw bracket II310 are respectively arranged at the middle of the left and right sides of the lower end surface of the Y-axis base plate 309; the Y-axis ball screw 308 is connected between the Y-axis ball screw bracket I303 and the Y-axis ball screw bracket II310, and one side of the Y-axis ball screw 308 is connected to the Y-axis ball screw bracket I303 and the Y-axis ball screw bracket II310. One side is connected to the Y-axis ball screw bracket I303 through the Y-axis screw support I304, and the other side is connected to the Y-axis ball screw bracket II310 through the Y-axis screw support II311; the Y-axis screw slide frame 306 is slidably connected to the Y-axis ball screw 308 through the screw nut; the Y-axis stepping motor 301 is connected to one end of the Y-axis ball screw 308 through the Y-axis coupling 303; the Y-axis linear guide rails 307 are respectively arranged on the front and rear sides of the lower end surface of the Y-axis base plate 309 and are symmetrical to each other; the Y-axis guide rail sliders 305 are respectively slidably connected to the Y-axis linear guide rails 307; the middle part of the upper end surface of the Y-axis base plate 309 is fixedly connected to the X-axis screw slide frame 206 and the X-axis guide rail slider 205 respectively.

[0042] As attached Figure 5 As shown, the electromagnetic induction heating component 4 includes an induction coil base plate 401, an electromagnetic induction heating coil 402, a coil magnet 403, a sensor bracket I 404, an infrared temperature sensor I 405 and a distance sensor 406; the electromagnetic induction heating coil 402 is installed inside the coil magnet 403; the coil magnet 403 is evenly installed on the lower end surface of the induction coil base plate 401; the sensor bracket I 404 is fixed to the middle part of one side of the induction coil base plate 401; the distance sensor 406 and the infrared temperature sensor I 405 are respectively installed on the sensor bracket I 404; the middle part of the upper end surface of the induction coil base plate 401 is respectively fixed to the Y-direction lead screw sliding bracket 306 and the Y-direction guide rail sliding block 305.

[0043] As attached Figure 6 As shown, the dehumidification component 5 includes a resistance wire mounting frame 501, a resistance wire 502, an infrared temperature sensor II 503, a humidity sensor 504 and a sensor bracket II 505; the resistance wire 502 is horizontally installed on the lower end surface of the resistance wire mounting frame 501; the sensor bracket II 505 is fixed on one side of the bottom of the resistance wire mounting frame 501; the humidity sensor 504 and the infrared temperature sensor II 503 are respectively installed on the sensor bracket II 505; the resistance wire mounting frame 501 is fixed between the left and right sides of the bottom front end of the frame 6.

[0044] A method for hot repair of asphalt pavement, as shown in the following Figure 7 As shown, the following steps are included:

[0045] S1: Induction heating preparation stage:

[0046] (S1.1) Setting initial parameters: Determine the optimal heating temperature T = 95°C and the optimal heating time t 1 = 70s, the optimal heating distance between the bottom surface of the electromagnetic induction heating coil 402 and the road surface is d = 10mm, and the extreme value of the suitable heating temperature difference of the asphalt material is a = 5°C;

[0047] (S1.2) Turn on the distance sensor 406, the infrared temperature sensor I 405, the infrared temperature sensor II 503 and the humidity sensor 504. The computer reads the measurement result of the distance sensor 406 to obtain the distance l between the bottom surface of the electromagnetic induction heating coil 402 and the road surface. The computer controls the X-axis stepper motor, the Y-axis stepper motor and the Z-axis stepper motor to rotate respectively, and adjusts the position of the induction heating coil so that the distance l between the bottom surface of the electromagnetic induction heating coil 402 and the road surface is l = d = 10 mm, and the bottom surface of the electromagnetic induction heating coil 402 is facing the road surface that needs to be heated and repaired;

[0048] (S1.3) The humidity sensor 504 measures the air humidity above the road surface in real time as h, and the infrared temperature sensor II 503 measures the road surface asphalt temperature in real time as T 2 ; Controlled by computer: if h≥40%, the resistance wire 502 starts to heat the road surface to remove ground moisture; if h<40%, the resistance wire 502 stops heating, the device moves forward, and the induction heating coil 402 performs thermal repair on the road surface asphalt material; during this period, if T 2 ≤Ta=90℃, then increase the current of the resistance wire 502 to improve the heating effect; if T 2 ≥T+a=100℃, then reduce the current of the resistance wire 502 to prevent the asphalt material from softening and expanding due to excessive temperature, which will lead to a decrease in the structural strength of the material; if 90℃=Ta<T 2 <T+a=100°C, then the heating current of the resistance wire 502 is maintained;

[0049] S2: Induction heating stage:

[0050] (S2.1) The induction heating coil 402 is powered on, the coil heats up and starts to heat the road asphalt; the computer starts timing the heating time t;

[0051] (S2.2) Computer calculation and control: The infrared temperature sensor I405 measures the asphalt temperature of the heated road surface as T 1 :If T 1 ≤Ta=90℃, then increase the current of the induction heating coil 402 to improve the heating effect; if T 1 ≥T+a=100℃, then reduce the current of the induction heating coil 402 to prevent the asphalt material from softening and expanding due to excessive temperature, which will lead to a decrease in the structural strength of the material; if 90℃=Ta<≤T 1 <≤T+a=100°C, then the heating current of the induction heating coil 402 is maintained;

[0052] (S2.3) is controlled by computer calculation: if t≤t 1 = 70s, the induction heating coil 402 maintains the thermal repair of the road asphalt material; if t>t 1 = 70s, the thermal repair work of the asphalt material is completed, the induction heating coil 402 is powered off, and the heating stops;

[0053] (S2.4) The device moves forward and starts hot repairing the asphalt material of the next road surface;

[0054] (S2.5) Repeat steps (S2.1) to (S2.4) until all target pavement asphalt materials have completed thermal repair.

[0055] Matters not described in detail in the present invention are all common knowledge.

[0056] The embodiments described above are merely descriptions of preferred implementation modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A method for hot repair of asphalt pavement, based on an electromagnetic induction heating device, characterized in that: The device includes an X-direction horizontal movement component, a Y-direction horizontal movement component, a Z-direction vertical movement component, an electromagnetic induction heating component, a frame, and rollers; the Z-direction vertical movement component is arranged between the left and right sides of the frame along the Z-axis direction; the X-direction horizontal movement component is arranged below the middle part of the Z-direction vertical movement component along the X-axis direction; the Y-direction horizontal movement component is arranged below the X-direction horizontal movement component along the Y-axis direction; the electromagnetic induction heating component is arranged below the Y-direction horizontal movement component; the rollers are respectively arranged at the four corners of the bottom of the frame; The electromagnetic induction heating component includes an induction coil base plate, an electromagnetic induction heating coil, a coil magnetic conductor, a distance sensor, an infrared temperature sensor I, and a sensor bracket I; the electromagnetic induction heating coil is installed inside the coil magnetic conductor; the coil magnetic conductors are evenly arranged on the lower end surface of the induction coil base plate; the sensor bracket I is fixed in the middle of one side of the induction coil base plate; the distance sensor and the infrared temperature sensor I are respectively installed on the sensor bracket I; A dehumidification component is arranged on the front side of the bottom of the frame; The dehumidification component includes a resistance wire mounting rack, a resistance wire, a humidity sensor, an infrared temperature sensor II, and a sensor bracket II; the resistance wire is installed on the lower end surface of the resistance wire mounting rack; the sensor bracket II is fixed on one side of the bottom of the resistance wire mounting rack; the humidity sensor and the infrared temperature sensor II are respectively installed on the sensor bracket II; the resistance wire mounting rack is fixed between the left and right sides of the front bottom of the frame; The repair method includes the following steps: S1. Induction heating preparation stage: (S1.1) Set initial parameters: Determine the optimal heating temperature T of the road surface asphalt material to be heated, the optimal heating time t1, the optimal heating distance d between the lower bottom surface of the electromagnetic induction heating coil and the road surface, and the extreme value a of the suitable heating temperature difference of the asphalt material; (S1.2) Turn on the distance sensor, the infrared temperature sensor I, the infrared temperature sensor II, and the humidity sensor. The computer reads the measurement result of the distance sensor to obtain the distance l between the lower bottom surface of the electromagnetic induction heating coil and the road surface. The computer respectively controls the rotation of the X-direction stepper motor, the Y-direction stepper motor, and the Z-direction stepper motor to adjust the position of the induction heating coil so that the distance l between the lower bottom surface of the electromagnetic induction heating coil and the road surface is equal to d, and the lower bottom surface of the electromagnetic induction heating coil faces the road surface to be heated and repaired; (S1.3) The humidity sensor measures the air humidity h above the road surface in real time, and the infrared temperature sensor II measures the road surface asphalt temperature T2 in real time. Controlled by the computer: If h > 40%, the resistance wire starts to heat the road surface to remove the ground moisture. If h < 40%, the resistance wire stops heating, and the device moves forward, and the induction heating coil is used to thermally repair the road surface asphalt material. During this period, if T2 ≤ T - a, the current of the resistance wire is increased to improve the heating effect; if T2 ≥ T + a, the current of the resistance wire is decreased to avoid softening and swelling of the road surface asphalt material due to excessive temperature, resulting in a decrease in the material structure strength; if T - a < T2 < T + a, the heating current of the resistance wire is maintained; S2. Induction heating stage: (S2.1) The induction heating coil is powered on, and the coil temperature rises to start heating the road surface asphalt; the computer starts timing the heating time t; (S2.2) Controlled by computer calculation: The infrared temperature sensor I measures the temperature of the heated road surface asphalt as T1. If T1 ≤ T - a, the current of the induction heating coil is increased to improve the heating effect; if T1 ≥ T + a, the current of the induction heating coil is decreased to avoid softening and expansion of the road surface asphalt material due to excessive temperature, resulting in a decrease in the material structure strength; if T - a < T1 < T + a, the heating current of the induction heating coil is maintained. (S2.3) Controlled by computer calculation: If t ≤ t1, the induction heating coil maintains the heat repair of the road surface asphalt material; if t > t1, the heat repair work of the asphalt material is completed, the induction heating coil is powered off, and the heating stops. (S2.4) The device moves forward to start the heat repair of the asphalt material on the next road surface. (S2.5) Repeat the induction heating stage of step S2 until the heat repair of all target road surface asphalt materials is completed.

2. A method for hot repair of asphalt pavement according to claim 1, characterized in that: The Z - direction vertical movement component includes a Z - direction stepping motor, a Z - direction coupling, a Z - direction ball screw support I, a Z - direction ball screw, a Z - direction screw sliding frame, a Z - direction linear guide rail slider, a Z - direction linear guide rail, a Z - direction base plate, a Z - direction ball screw support II, and a vertical - horizontal platform connecting piece; the Z - direction base plates are respectively vertically arranged on the left and right sides inside the frame and are symmetric to each other; on both sides of the inner end face of the Z - direction base plate, Z - direction linear guide rails are vertically arranged, and the Z - direction linear guide rails on both Z - direction base plates are symmetric to each other; the Z - direction ball screw support I and the Z - direction ball screw support II are respectively arranged on the upper and lower sides of the middle part of the inner end face of one side of the Z - direction base plate; the Z - direction ball screw is connected between the Z - direction ball screw support I and the Z - direction ball screw support II; the Z - direction stepping motor is connected to the upper end of the Z - direction ball screw through the Z - direction coupling; the left and right ends of the vertical - horizontal platform connecting piece are respectively slidably connected to the two - side Z - direction linear guide rails through the Z - direction linear guide rail sliders; the middle part of one side of the vertical - horizontal platform connecting piece is slidably connected to the Z - direction ball screw through the Z - direction screw sliding frame.

3. A method for hot repair of asphalt pavement according to claim 2, characterized in that: The X-axis horizontal movement assembly includes an X-axis stepping motor, an X-axis coupling, an X-axis ball screw bracket I, an X-axis screw support I, an X-axis guide rail slider, an X-axis screw slide frame, an X-axis linear guide rail, an X-axis ball screw, an X-axis base plate, an X-axis ball screw bracket II and an X-axis screw support II; the X-axis ball screw bracket I and the X-axis ball screw bracket II are respectively arranged at the middle of the left and right sides of the lower end surface of the X-axis base plate; the X-axis ball screw is connected between the X-axis ball screw bracket I and the X-axis ball screw bracket II, and the X-axis ball screw One side is connected to the X-axis ball screw bracket I through the X-axis screw support I, and the other side is connected to the X-axis ball screw bracket II through the X-axis screw support II; the X-axis screw sliding frame is slidably connected to the X-axis ball screw; the X-axis stepping motor is connected to one end of the X-axis ball screw through the X-axis coupling; the X-axis linear guide rails are respectively arranged on the front and rear sides of the lower end surface of the X-axis base plate and are symmetrical to each other; the X-axis guide sliders are respectively slidably connected to the X-axis linear guide rails; the upper end surface of the X-axis base plate is fixedly connected to the bottom of the vertical and horizontal platform connecting piece.

4. A method for hot repair of asphalt pavement according to claim 3, characterized in that: The Y-axis horizontal moving assembly includes a Y-axis stepping motor, a Y-axis coupling, a Y-axis ball screw bracket I, a Y-axis screw support I, a Y-axis guide slider, a Y-axis screw sliding frame, a Y-axis linear guide, a Y-axis ball screw, a Y-axis base plate, a Y-axis ball screw bracket II and a Y-axis screw support II; the Y-axis base plate is fixedly connected to the middle of the bottom end of the vertical horizontal platform connecting piece; the Y-axis ball screw bracket I and the Y-axis ball screw bracket II are respectively arranged in the middle of the left and right sides of the lower end surface of the Y-axis base plate; the Y-axis ball screw is connected between the Y-axis ball screw bracket I and the Y-axis ball screw bracket II, and one side of the Y-axis ball screw is connected by the Y-axis screw Support I is connected to Y-axis ball screw bracket I, and the other side is connected to Y-axis ball screw bracket II through Y-axis screw support II; the Y-axis screw slide frame is slidably connected to the Y-axis ball screw; the Y-axis stepper motor is connected to one end of the Y-axis ball screw through a Y-axis coupling; the Y-axis linear guides are respectively arranged on the front and rear sides of the lower end surface of the Y-axis base plate and are symmetrical to each other; the Y-axis guide sliders are respectively slidably connected to the Y-axis linear guides; the middle part of the upper end surface of the Y-axis base plate is fixedly connected to the X-axis screw slide frame and the X-axis guide slider respectively; the middle part of the upper end surface of the induction coil base plate is fixedly connected to the Y-axis screw slide frame and the Y-axis guide slider respectively.

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